Institute of Electrical and Electronics Engineers, IEEE Transactions on Instrumentation and Measurement, 6(55), p. 1985-1995, 2006
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The gravitational wave detector Virgo is presently being commissioned. A significant part of the last three years was spent in setting up the cavity length control system. This paper was carried out with steps of increasing complexity: locking a simple Fabry-Perot cavity and then a Michelson interferometer (ITF) with Fabry-Perot cavities in both arms, and finally recycling the light beam into the ITF. The applied strategy and the main results obtained are described.